Panasonic U-8MF2E8 - Page 15

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3WAY SYSTEM
Control Functions
1
3. Compressor Control
Condensation temperature area at cooling operation
3-6-2. Condensation Temperature Adjustment by Roadmap Control
The “B” area’s target temperature is different due to cooling, heating and mixed cooling/heating operation.
Target lower temperature
(Tc_tgt_min)
Target upper temperature
(Tc_tgt_max)
Cooling
Heating
Cooling operation
The purpose of this control at cooling is to prevent abnormal high-pressure.
Compressor capacity can increase
Compressor capacity cannot increase
Thermostat OFF
Compressor capacity decreases
Tc_tgt_max.
Tc_tgt_min.
deg
B area
A area
C area
Mixed cooling/heating
53.0°C
48.0°C
48.0°C
55.0°C
51.0°C
51.0°C
The heating capacity is adjusted with this control. It also prevents abnormal high-pressure.
Condensation temperature area at heating operation and mixed cooling/heating operation
Condensation temperature area at heating operation
Compressor capacity can increase
Compressor capacity holds
Thermostat OFF
Compressor capacity decreases
Tc_tgt_max.
Tc_tgt_min.
deg
B area
A area
C area
* PX is usually fixed to 58 degrees. If the high pressure goes up rapidly after the compressor starts, the system
experiences urgent stop. The next time the system will start with lower PX.
* In the B area, the compressor capacity changes depending on the refrigerant condition.
* When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes
if the condensation temperature area is C area.
* The condensation temperature is not adjusted when there are one or more indoor units that select the test run.
Heating operation
SM830226-003WAYECO-iSYSTEM.in77SM830226-003WAYECO-iSYSTEM.in77 2013/02/1311:52:242013/02/1311:52:24